ade, it is sunk flush with the wall by hot-fitting it, and kept
in position by several small steel screws fixed into the sound horn, just
as in the treatment for sand-crack (see p. 174). This will serve the
useful purpose of maintaining in position any dressing that may be thought
necessary, of acting as a support to the horn left on each side of the
portion removed, and of keeping the exposed structures free from dirt and
grit.

Practical points to be remembered in fitting plates of this description
to the feet are: The plate must never quite reach the shoe, or it will
participate in the concussion of progression, and so loosen the screws that
hold it in place. For the same reason, that portion of the sole adjoining
the piece of horn removed must have its bearing on the shoe relieved. The
screws holding the plate should be oiled to prevent rusting, and should
take an oblique direction in order to obtain as great a hold as possible on
the wall.

When excision is deemed unwise or unnecessary, treatment should be directed
towards maintaining the cavity in a state of asepsis. To this end it
should be thoroughly cleaned of its contents, and afterwards dressed with
medicated tow. The ordinary tar and grease stopping is as suitable as any.
This, together with the tow, is tightly plugged into the opening and kept
in position by a wide-webbed shoe. Instead of the tar stopping and the tow,
there may be used with advantage the artificial hoof-horn of Defay (see p.
152). Before using this the cavity should again be thoroughly cleaned out,
and should in addition be mopped out with ether. The latter injunction is
important, as unless the grease is thus first removed, the composition will
fail to adhere to the horn. With the cavity thus cleaned and prepared, the
artificial horn, melted ready to hand, is poured into it and allowed to
set.

In every case, no matter what else the treatment, the bearing of the horn
adjacent to the lesion should be removed from the shoe.

Whether practising the method of plugging the cavity or that of excision of
the wall external to it, attempts to quickly obtain a new growth of horn
from the coronet should be made. To further that, frequent stimulant
applications should be used. Ointment of Biniodide of Mercury 1 in 8, of
Cantharides 1 in 8, or the ordinary Oil of Cantharides, either will serve.

3. KERAPHYLLOCELE.

_Definition_.--By this term is indicated an enlargement forming on the
inner surfa